Building thermal storage air conditioning system

Abstract

To provide a skeleton heat storage air-conditioning system that can suppress heat loss during heat storage operation and release heat in a direction to be air-conditioned.SOLUTION: A skeleton heat storage air-conditioning system 1 includes: piping 10 arranged inside a skeleton 2 having a predetermined thickness and formed into a plate shape, and through which a heating medium circulates; and a connection member 30 arranged inside the skeleton 2, connected to the piping 10, extending in a thickness direction of the skeleton 2 and having a heat conductivity that is higher than that of the skeleton 2.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a building structure thermal storage air conditioning system. [Background technology]

[0002] There has been an increasing number of cases in which TABS (Thermo-Active Building System) is used for air conditioning systems that utilize the large thermal capacity of a building's framework to store and release heat. Normally, when incorporating a heat storage mechanism into a building, water or ice is used as the heat storage medium, but by burying hot and cold water pipes within the framework, the framework itself can be used as the heat storage medium, thereby saving space. In addition, heat storage mechanisms are highly compatible with the use of natural energy, and have the advantage of being able to reduce peak power consumption, making them a useful system for creating a sustainable society.

[0003] The basic operation of TABS is to store heat when the building is not in use and release it when the building is in use to provide air conditioning. Compared to conventional air conditioning systems, there is a significant delay between the time the system is activated and the time the air conditioning capacity is realized. For this reason, in order to implement the aforementioned operating cycle, it is necessary to properly understand the building's usage times, otherwise energy conservation will be counterproductive. Another issue is that in order to utilize TABS in the desired location at the desired time, it is necessary to understand the heat storage and release characteristics of TABS.

[0004] Given this background, in order to make TABS user-friendly, it is desirable for the system to have a short delay before the air conditioning capacity is realized and to dissipate heat in the desired direction. Also, in TABS, the longer the heat storage time, the more heat will diffuse within the structure, resulting in greater heat loss, so from the perspective of energy conservation, it is important to quickly reach the desired heat storage capacity.

[0005] Patent Document 1 below proposes a building frame heat storage structure in which a metal radiant panel made of steel or other material is placed facing the interior of the building and fixed to the frame. The radiant panel is designed to efficiently promote heat storage in the frame. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent No. 5692603 Summary of the Invention [Problem to be solved by the invention]

[0007] However, in the building structure described in Patent Document 1, metal members (radiant panels) are exposed on the building surface (the surface of the building facing the interior), which causes heat loss during heat storage operation. Also, it is desirable to radiate heat in the direction of the target air conditioning.

[0008] Therefore, the present invention has been made in consideration of the above circumstances, and provides a structural heat storage air conditioning system that can suppress heat loss during heat storage operation and can dissipate heat in the direction of the object to be air-conditioned. [Means for solving the problem]

[0009] In order to achieve the above object, the present invention employs the following means. That is, the structural body thermal storage air conditioning system according to the present invention comprises a piping that is arranged inside a structural body formed in a plate shape with a predetermined thickness and through which a heat medium flows, and a connecting member that is arranged inside the structural body, connected to the piping, extends in the thickness direction of the structural body, and has a thermal conductivity higher than that of the structural body, the structural body being made of reinforced concrete, and the connecting member comprises a main body portion that extends in the thickness direction of the structural body, a reinforcing bar support portion that is provided at one end of the main body portion and abuts against a reinforcing bar of the structural body and is supported by the reinforcing bar, and a connecting member that is provided at the other end of the main body portion and has a shape that fits along the bottom of the piping and into which the piping is fitted. Roughly U-shapedand a piping support portion.

[0010] In a building thermal storage air conditioning system configured in this way, the connecting members connected to the pipes through which the heat medium flows have a higher thermal conductivity than the building itself. If only the pipes were placed inside the building, the area around the pipes in the building would be cooled (or heated), but with the above configuration, the area around the connecting members in the building as well as the area around the pipes in the building is cooled (or heated). This improves the building's thermal storage efficiency per unit time and reduces heat loss during thermal storage operation. Furthermore, the connection member extends in the thickness direction of the body, so that heat can be dissipated into the space facing the tip of the connection member in the body, and therefore heat can be dissipated in the direction of the target air conditioning. Furthermore, the connection member can be installed so that the reinforcing bar support portion of the connection member is supported by the reinforcing bar of the frame, which makes installation easy.

[0013] In the building structure thermal storage air conditioning system according to the present invention, the reinforcing bar support portion extends in a direction intersecting the thickness direction of the building structure. In a plate shape shape And It may be possible.

[0014] In a structure heat storage air conditioning system configured in this manner, the reinforcing bar support portion of the connecting member is shaped to extend in a direction that intersects with the thickness direction of the structure, so that when pouring concrete for the structure, the reinforcing bar support portion prevents the connecting member from coming loose.

[0015] In the building structure thermal storage air conditioning system according to the present invention, the building structure may be a floor slab.

[0016] In a building structure thermal storage air conditioning system configured in this manner, by installing the building structure thermal storage air conditioning system on the floor slab, heat can be efficiently released into the space above and below the floor slab. [Effects of the Invention]

[0017] The building structure thermal storage air conditioning system according to the present invention can suppress heat loss during thermal storage operation and can also dissipate heat in the direction of the object to be air-conditioned. [Brief explanation of the drawings]

[0018] [Figure 1] 1 is a vertical cross-sectional view showing a building structure thermal storage air conditioning system according to one embodiment of the present invention. [Figure 2] 1A and 1B are cross-sectional views of a model for three-dimensional unsteady heat transfer analysis of a structural heat storage air conditioning system according to one embodiment of the present invention, where (a) is Example 1, (b) is Example 2, (c) is Comparative Example 1, and (d) is Comparative Example 2. [Figure 3] 1 shows a model of three-dimensional unsteady heat transfer analysis of a building thermal storage air conditioning system according to one embodiment of the present invention, where (a) is an overhead view, (b) is a cross-sectional view, and (c) is a cross-sectional view showing the configuration of the connecting member. [Figure 4] This shows the changes in the heat dissipation and heat storage amounts above and below in a three-dimensional unsteady heat transfer analysis of a structural heat storage air conditioning system according to one embodiment of the present invention, where (a) is Example 1, (b) is Example 2, (c) is Comparative Example 1, and (d) is Comparative Example 2. DETAILED DESCRIPTION OF THE INVENTION

[0019] A building thermal storage air conditioning system according to one embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a vertical cross-sectional view showing a building structure thermal storage air-conditioning system according to one embodiment of the present invention. As shown in Fig. 1, the structural body thermal storage air conditioning system 1 of this embodiment is installed in a floor slab (structural body) 2 inside a building. The structural body thermal storage air conditioning system 1 stores heat in the floor slab 2 and is operated so as to radiate the heat to a room (space) A1 below the floor slab 2 and a room (space) A2 above the floor slab 2 when the building is in use.

[0020] The floor slab 2 includes a structural floor slab plate 21 and an additional floor slab plate 26.

[0021] The structural floor slab 21 is made of reinforced concrete having a predetermined structural strength. The structural floor slab 21 is formed in a substantially plate-like shape having a predetermined thickness.

[0022] The structural floor slab 21 has a plurality of reinforcing bars 22 and a structural concrete portion 23. The reinforcing bars 22 are arranged in a predetermined direction. The reinforcing bars 22 are embedded inside the structural concrete portion 23. The structural concrete portion 23 is formed in a plate shape and arranged with its thickness direction oriented vertically. In FIG. 1, the reinforcing bars 22 are shown arranged in a direction perpendicular to the plane of the paper, but the reinforcing bars 22 may also be arranged in a predetermined horizontal direction, such as the left-right direction of the plane of the paper. The structural floor slab 21 is made of concrete that is designed to support loads over the long term and during earthquakes, taking into account weight and rigidity.

[0023] The additional floor slab slab 26 is arranged on one side in the thickness direction of the structural floor slab slab 21, i.e., on the upper side. The additional floor slab slab 26 is formed in a plate shape and is arranged with its thickness direction facing vertically. The additional floor slab slab 26 is made of concrete or reinforced concrete. The additional floor slab slab 26 has a concrete section 27 filled with concrete. The concrete section 27 is formed in a plate shape that follows a substantially horizontal plane. The additional floor slab slab 26 is concrete that is considered only in terms of weight and does not support loads (concrete that is not treated as a structure).

[0024] A floor finishing material 29 is disposed on the interior side, i.e., the upper side, of the additional floor slab 26. The floor finishing material 29 is made of a finishing material such as flooring or carpet. Note that a heat insulating material or intermediate layer (not shown) may be disposed between the additional floor slab 26 and the floor finishing material 29.

[0025] The building body thermal storage air conditioning system 1 includes a plurality of pipes 10 and embedded metal fittings (connecting members) 30.

[0026] The piping 10 is buried inside the additional floor slab 26. The piping 10 extends in a predetermined direction. The piping 10 is arranged vertically above the reinforcing bars 22. The piping 10 is arranged along a substantially horizontal plane. In this embodiment, the piping 10 is arranged along the extension direction of the reinforcing bars 22. The piping 10 is made of a metal member such as a three-layer aluminum pipe.

[0027] The piping 10 is connected to a water supply device and a treatment device (not shown). A heat transfer medium (cold / hot water) at a predetermined temperature is supplied to the piping 10 from a water supply device (not shown). Heat is exchanged between the cold / hot water supplied to the piping 10, the surrounding additional floor slab 26, and the air in the living rooms A1 and A2. The heat transfer medium that has circulated inside the piping 10 is discharged from the piping 10 to a treatment device (not shown) after heat exchange.

[0028] The embedded hardware 30 connects the reinforcing bars 22 and the pipes 10. The embedded hardware 30 is embedded inside the floor slab 2. The embedded hardware 30 is arranged along the extension direction of the pipes 10 and the reinforcing bars 22. The embedded hardware 30 is made of a metal member such as aluminum that has a higher thermal conductivity than the floor slab 2. In this embodiment, all of the pipes 10 are connected to the reinforcing bars 22 arranged vertically below by the embedded hardware 30, but there may be some pipes 10 that are not connected to the reinforcing bars 22.

[0029] The embedded metal fitting 30 has a metal fitting main body (main body) 31, a lower extension (reinforcing bar support part) 32, and an upper locking part 33.

[0030] The hardware main body 31 extends in the vertical direction (thickness direction of the floor slab 2). The hardware main body 31 is formed in a plate shape. The plate surface of the hardware main body 31 is arranged along the vertical direction (connection direction).

[0031] The lower extension portion 32 is provided at the lower end (one end) of the hardware main body portion 31. The lower extension portion 32 is embedded inside the structural floor slab slab 21. The lower extension portion 32 is formed in a plate shape. The plate surface of the lower extension portion 32 is arranged so as to be perpendicular to the plate surface of the hardware main body portion 31. In other words, the lower extension portion 32 extends in a horizontal direction (intersecting direction) perpendicular to the hardware main body portion 31. The lower extension portion 32 is arranged in abutment against the upper end of the reinforcing bar 22. The shape of the lower extension portion 32 can be set as appropriate as long as it is a shape that can be supported by the reinforcing bar 22.

[0032] The upper retaining portion 33 is provided at the upper end (other end) of the hardware main body 31. The upper retaining portion 33 is embedded inside the additional floor slab 26. The upper retaining portion 33 has a shape that fits along the bottom of the pipe 10. The upper surface of the upper retaining portion 33 has a shape that bulges downward. The pipe 10 is fitted into the upper retaining portion 33, and the upper retaining portion 33 retains the pipe 10.

[0033] Next, we performed a three-dimensional unsteady heat transfer analysis to verify the effects for the four cases shown in (a) to (d) of Figure 2. Figure 3 shows the analytical model shown in (a) to (c). In Example 1 shown in Figure 2(a) and Example 2 shown in Figure 2(b), the embedded metal fittings 30 are embedded as in the above-described embodiment. In Comparative Example 1 shown in Figure 2(c) and Comparative Example 2 shown in Figure 2(d), the embedded metal fittings 30 are not embedded. In Example 2 and Comparative Example 2, the insulating material 28 is placed on the upper side of the additional floor slab 26.

[0034] As shown in Figure 3(a), the analytical model has a shape of 900 mm wide x 1000 mm deep x 250 mm high. The width is the direction in which the three embedded metal fittings 30 are arranged with a gap between them. The depth is the direction in which the embedded metal fittings 30 extend. As shown in Figure 2, the height of the structural floor slab 21 is 150 mm, and the height of the additional floor slab 26 is 100 mm. As shown in Figures 2(b) and (d), the height of the insulation material 28 is 20 mm. The insulation material 28 was taken into account by providing a virtual thermal resistance.

[0035] The analysis conditions are as follows: The water temperature is 18°C. The water flow rate is 2.5 L / min, and the convective heat transfer coefficient inside the pipe is 1390 W / m 2 The temperature is set to a fixed value of K. The ambient temperature is set to 26°C. The embedded metal fittings 30 are set to the physical properties of aluminum. The structural floor slab 21 and the additional floor slab 26 are set to the physical properties of concrete. The heat insulating material 28 is set to the physical properties of Styrofoam (registered trademark). The piping 10 is set to the physical properties of a three-layer aluminum pipe. The initial condition is set to 26°C. The upper overall heat transfer coefficient is 11.5 W / m 2 K. The overall heat transfer coefficient at the bottom is 9.0 W / m 2 K. The pitch of the pipe 10 is 200 mm.

[0036] A transient analysis was conducted after supplying cold water for five hours, and then stopping the water supply for another five hours. A constant convective heat transfer coefficient was applied to the heat dissipation to the upper and lower spaces, and the upper and lower air temperatures were kept constant at 26°C.

[0037] The amount of heat storage was calculated using the following formula (1).

[0038]

number

[0039] Comparing Example 1 and Comparative Example 1, the installation of the buried metal fittings 30 increased the amount of heat storage by approximately 1.5 times after five hours of water flow. Furthermore, the amount of heat dissipated to the top was approximately 1.1 times, and the amount of heat dissipated to the bottom was approximately 2.0 times after five hours of water flow, significantly improving air conditioning performance. In particular, the amount of heat dissipated to the bottom increased, and it was found that the heat dissipation destination can be adjusted by pointing the tip of the buried metal fittings 30 (the lower extension 32) toward the desired location. Furthermore, because the amount of instantaneous heat storage is large, it takes a short time to reach the target amount of heat storage, which is expected to reduce heat loss and the power required to transport chilled water. Because there is a short delay between system startup and the air conditioning capacity being realized, this system makes it easier for building users to manage their operating schedules.

[0040] On the other hand, the decay of the heat storage amount after water supply is stopped is little affected by the presence or absence of the buried metal fittings 30. Because the amount of heat storage at the start of heat dissipation is different, it appears that the system with the buried metal fittings 30 buried has better heat dissipation characteristics, but there was almost no difference in the time constant of the exponential decay. Regarding heat dissipation from the top and bottom surfaces, due to the difference in temperature distribution within the structure, the system with the buried metal fittings 30 buried dissipated more heat to the bottom. The same tendency as above was confirmed when comparing Example 2 and Comparative Example 2.

[0041] Comparing the presence and absence of insulation on the upper side of floor slab 2, the amount of heat stored when insulation 28 was present was approximately 1.1 times greater than when insulation 28 was not present. This was due to a decrease in the amount of heat released from the upper part of floor slab 2. On the other hand, there was almost no difference in the amount of heat released from the lower part of floor slab 2 while water was being supplied, but five hours after water supply was stopped, the amount of heat released was approximately 1.3 times greater. The insulation 28 made it difficult for the stored heat to escape, and it was possible to maintain the amount of heat released to the lower part of the slab for a long period of time.

[0042] Although verification was conducted for a certain shape, qualitatively similar trends can be obtained if a highly thermally conductive material is used for the embedded metal fittings 30 and the shape is such that the tip (lower extension 32) faces in the direction in which heat is desired to be dissipated while in contact with the pipe 10. It is not necessary to use embedded metal fittings 30 for all of the pipes 10, and they may be used locally.

[0043] By installing buried metal fittings 30 made of aluminum or the like along the buried pipes 10, it is possible to dramatically increase the air conditioning capacity. It also makes it possible to reduce three problems: the long time delay before the air conditioning capacity is realized, the difficulty of dissipating heat to the desired location, and the occurrence of heat loss due to the long heat storage time.

[0044] In the structural body thermal storage air conditioning system 1 configured in this manner, the embedded metal fittings 30 connected to the pipes 10 through which a heat medium flows have a higher thermal conductivity than the floor slab 2. If only the pipes 10 were placed inside the floor slab 2, the area around the pipes 10 in the floor slab 2 would be cooled (or heated), but in the structural body thermal storage air conditioning system 1, in addition to the area around the pipes 10 in the floor slab 2, the area around the embedded metal fittings 30 in the floor slab 2 is also cooled (or heated). Therefore, the thermal storage efficiency of the floor slab 2 per unit time is good, and heat loss during thermal storage operation can be suppressed.

[0045] Furthermore, the embedded metal fittings 30 extend in the thickness direction of the floor slab 2. Therefore, heat can be dissipated to the space (space A1) facing the lower extension part 32, which is the tip of the embedded metal fittings 30 in the floor slab 2, and therefore heat can be dissipated in the direction to be air-conditioned (space A1 side).

[0046] Furthermore, the embedded metal fittings 30 can be installed so that the lower extensions 32 of the embedded metal fittings 30 are supported by the reinforcing bars 22 of the floor slab 2, which makes installation easy.

[0047] In addition, since the lower extension portion 32 of the embedded hardware 30 has a shape that extends in a direction that intersects with the thickness direction of the floor slab 2, the lower extension portion 32 prevents the embedded hardware 30 from coming loose when pouring concrete for the floor slab 2.

[0048] Furthermore, by installing the structural heat storage air conditioning system 1 on the floor slab 2, heat can be efficiently released to the space A2 above the floor slab 2 and the space A1 below it.

[0049] The assembly procedures, shapes and combinations of the components, etc. shown in the above-described embodiments are merely examples, and various modifications can be made based on design requirements, etc., within the scope of the present invention.

[0050] For example, in the embodiment shown above, the lower extension 32 is provided at the lower end of the buried hardware 30, and the upper locking portion 33 is provided at the upper end of the buried hardware 30, but the present invention is not limited to this. The lower end of the hardware body 31 of the buried hardware 30 may be connected to the reinforcing bar 22, and the upper end of the hardware body 31 may be connected to the piping 10.

[0051] In the above embodiment, the structural body thermal storage air conditioning system 1 is installed on the floor of a building, but the present invention is not limited to this. The structural body thermal storage air conditioning system 1 may be installed on the ceiling, wall, etc., as long as it is installed facing the interior of the building. [Explanation of symbols]

[0052] 1...Building thermal storage air conditioning system 2...Floor slab (structure) 10...Piping 21...Structural floor slab 22...Reinforcing bars 26...Additional floor slab 30...Buried metal fittings (connecting members) 31...Metal body (body) 32...Lower extension (reinforced bar support) 33...Upper locking part

Claims

1. a pipe arranged inside a plate-shaped body having a predetermined thickness and through which a heat medium flows; a connecting member disposed inside the body, connected to the piping, extending in a thickness direction of the body, and having a thermal conductivity higher than that of the body; The structure is made of reinforced concrete, The connecting member is a main body portion extending in a thickness direction of the body; a reinforcing bar support portion provided at one end of the main body portion, abutting against a reinforcing bar of the skeleton and supported by the reinforcing bar; A structural heat storage air conditioning system characterized by having an approximately U-shaped pipe support portion provided at the other end of the main body portion, shaped to fit along the lower part of the pipe, and into which the pipe is fitted.

2. The building structure thermal storage air-conditioning system according to claim 1 , wherein the reinforcing bar support portion is shaped like a plate extending in a direction intersecting the thickness direction of the building structure.

3. 3. The building structure thermal storage air conditioning system according to claim 1, wherein the building structure is a floor slab.

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